Mechanical and environmental characteristics of geogrid-reinforced waste foundry sand beds

IF 1.3 Q3 ENGINEERING, GEOLOGICAL

Proceedings of the Institution of Civil Engineers-Ground Improvement Pub Date : 2022-02-25 DOI:10.1680/jgrim.21.00022

B. Chowdepalli, B. K. Karnamprabhakara, B. Umashankar

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引用次数: 0

Abstract

Different waste materials, such as fly ash and bottom ash, slag waste, and construction & demolition waste, have been extensively studied to replace depleting natural granular materials for fill applications. Waste foundry sand (WFS), a by-product from the aluminum metal casting industry, is one such waste material that can be a viable fill material. In the present study, extensive large-scale model experimental studies were performed on geogrid-reinforced WFS beds to understand their load-settlement behavior. Basic characterization studies on WFS included gradation, specific gravity, morphology, chemical composition, and compaction testing. During large-scale model experimental (LSME) testing, the geogrid reinforcement was placed at the optimum placement depth, and the maximum improvement in the load-carrying capacity of the footing resting on the reinforced WFS layer was quantified in terms of bearing capacity ratio. The bearing capacity ratio of reinforced WFS beds was found to range between 1.3 and 2.0 based on the test conditions considered in the study. The reduction in settlement of footing on reinforced WFS bed was also quantified. Additionally, the environmental impact of using WFS in reinforced foundation beds was assessed through leachate tests. The dissolved metal concentrations from leachate studies were found to be within permissible limits.

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土工格栅加筋铸造废砂床的力学与环境特性

不同的废物，如粉煤灰和底灰、矿渣废物、建筑和拆除垃圾，已经被广泛研究，以取代耗尽的天然颗粒材料的填充应用。废铸造砂(WFS)是铝金属铸造工业的副产品，是一种可以作为可行填充材料的废料。在本研究中，对土工格栅加筋WFS床进行了广泛的大尺度模型试验研究，以了解其荷载沉降行为。WFS的基本表征研究包括级配、比重、形貌、化学成分和压实测试。在大尺度模型试验(large- model experimental, LSME)试验中，将土工格栅加固置于最佳布设深度，以承载力比量化加固后WFS层基础承载能力的最大提升。根据本研究考虑的试验条件，发现加固WFS床的承载力比在1.3 ~ 2.0之间。此外，还量化了加固WFS地基基础沉降的减少。此外，通过渗滤液试验评估了在加固基础床中使用WFS的环境影响。研究发现，渗滤液中溶解的金属浓度在允许范围内。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Proceedings of the Institution of Civil Engineers-Ground Improvement ENGINEERING, GEOLOGICAL-

CiteScore

3.10

自引率

8.30%

发文量

期刊介绍： Ground Improvement provides a fast-track vehicle for the dissemination of news in technological developments, feasibility studies and innovative engineering applications for all aspects of ground improvement, ground reinforcement and grouting. The journal publishes high-quality, practical papers relevant to engineers, specialist contractors and academics involved in the development, design, construction, monitoring and quality control aspects of ground improvement. It covers a wide range of civil and environmental engineering applications, including analytical advances, performance evaluations, pilot and model studies, instrumented case-histories and innovative applications of existing technology.